AUtomated audio captioning (AAC) has attracted increasing interest in recent years. The AAC task is a combination of audio and natural language processing to create meaningful natural language sentences [1]}. The purpose of audio captioning is different from earlier audio processing tasks such as audio event/scene detection and audio tagging. Those earlier tasks do not aim to create descriptive natural language sentences whereas audio captioning aims to capture relations between events, scenes, and objects to create meaningful sentences. Audio captioning is a challenging audio processing task and has significant impact on enabling several services such as helping hearing-impaired people and building intelligent systems by understanding environmental sounds.
